Re: [PATCH v13 00/11] Introduce support for guest CET feature

Sean Christopherson
2020-07-13T18:13:30Z

On Wed, Jul 01, 2020 at 04:04:00PM +0800, Yang Weijiang wrote:
> Control-flow Enforcement Technology (CET) provides protection against
> Return/Jump-Oriented Programming (ROP/JOP) attack. There're two CET
> sub-features: Shadow Stack (SHSTK) and Indirect Branch Tracking (IBT).
> SHSTK is to prevent ROP programming and IBT is to prevent JOP programming.
>
> Several parts in KVM have been updated to provide VM CET support, including:
> CPUID/XSAVES config, MSR pass-through, user space MSR access interface,
> vmentry/vmexit config, nested VM etc. These patches have dependency on CET
> kernel patches for xsaves support and CET definitions, e.g., MSR and related
> feature flags.
>
> CET kernel patches are here:
> https://lkml.kernel.org/r/20200429220732.31602-1-yu-cheng.yu@intel.com
>
> v13:
> - Added CET definitions as a separate patch to facilitate KVM test.
> - Disabled CET support in KVM if unrestricted_guest is turned off since
> in this case CET related instructions/infrastructure cannot be emulated
> well.

This needs to be rebased, I can't get it to apply on any kvm branch nor on
any 5.8 rc. And when you send series, especially large series that touch
lots of code, please explicitly state what commit the series is based on to
make it easy for reviewers to apply the patches, even if the series needs a
rebase.